${\rm Y}$ production and nuclear modification at forward rapidity in Pb-Pb collisions at $\sqrt{{\text{s}}_{\text{NN}}}=5.02$ TeV

Abstract

The production of ${\rm Y}$ mesons in Pb-Pb collisions at a centre-of-mass energy per nucleon pair $\sqrt{s_{\mathrm{NN}}}$ = 5 TeV is measured with the muon spectrometer of the ALICE detector at the LHC. The yields as well as the nuclear modification factors are determined in the forward rapidity region $2.5<y<4.0$, as a function of rapidity, transverse momentum and collision centrality. The results show that the production of the ${\rm Y}$(1S) meson is suppressed by a factor of about three with respect to the production in proton-proton collisions. For the first time, a significant signal for the ${\rm Y}$(2S) meson is observed at forward rapidity, indicating a suppression stronger by about a factor 2-3 with respect to the ground state. The measurements are compared with transport, hydrodynamic, comover and statistical hadronisation model calculations.

24 pages, 7 captioned figures, 2 tables, authors from page 19, published version, figures at http://alice-publications.web.cern.ch/node/6694

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• Production of ${\rm Y}(\text{nS})$ mesons in Pb+Pb and $pp$ collisions at 5.02 TeV
• Observation of the ${\rm Y}$(3S) meson and suppression of ${\rm Y}$ states in PbPb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• The impact of fluctuating initial conditions on bottomonium suppression in 5.02 TeV heavy-ion collisions
• The imaginary part of the heavy-quark potential from real-time Yang-Mills dynamics
• Bottomonium suppression at RHIC and LHC in an open quantum system approach
• Model study on ${\rm Y}(nS)$ modification in small collision systems
• Transverse momentum dependent feed-down fractions for bottomonium production
• Inclusive, prompt and non-prompt $\mathrm{J}/\psi$ identification in proton-proton collisions at the Large Hadron Collider using machine learning
• Production of bottomonia states in proton+proton and heavy-ion collisions
• Multiplicity dependence of ${\rm Y}$ production at forward rapidity in pp collisions at $\sqrt{s}$ = 13 TeV
• Holographic bottomonium formation in a cooling strong-interaction medium at finite baryon density